[MacPorts] #44134: Update assimp to 3.1.1

[MacPorts]

#44134: Update assimp to 3.1.1
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  Reporter:  szhorvat@…  |      Owner:  mmoll@…
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  assimp      |
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Comment (by szhorvat@…):

 Meanwhile I compiled and tried assimp 3.1.1, which also produces broken
 .dae files when converting from .3ds.  This means that personally for me
 the issue doesn't have priority any more.

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Ticket URL: <https://trac.macports.org/ticket/44134#comment:2>
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